- Keri Russell (Ambassador Kate Wyler)
- Rufus Sewell (Hal Wyler)
- David Gyasi (Foreign Secretary Austin Dennison)
- Ali Ahn (Eidra Park)
- Rory Kinnear (Prime Minister Nicol Trowbridge)
- Ato Essandoh (Stuart Hayford)
- Bradley Whitford (Todd Penn)
- Allison Janney (President Grace Penn)
The Diplomat — S4E1
Episode: Windsor
Air Date: 2026-10-15
Runtime: 48 min
Overview
On an unplanned stopover at Windsor Castle, Kate grows wary of Hal and Grace's dynamic as she tries to contain the fallout from their covert actions.